Endō Munenobu served as a bushō during the Azuchi-Momoyama period. He was a retainer of the Date clan of Mutsu Province.
Munenobu was born as the son of Endō Motonobu. In 1585, following the unexpected death of Date Terumune, Motonobu martyred himself for his lord. As a result, Munenobu, atr the age of seventeen, inherited the headship of the Endō clan, becoming a veteran retainer of Date Masamune.
In the sixth month of 1588, in a battle against the allied forces of the Satake and Iwaki clans, Munenobu fought valiantly in defense of Tamura Castle (Moriyama Castle) in Kooriyama.
In 1592, for the Bunroku Campaign, Munenobu obeyed Masamune and crossed to the Korean Peninsula. He fought with valor but, after returning to Japan, was disappointed with the lack of recognition so he absconded, separating from the Date family for a period of time. Later, other retainers convinced him to return to the service of the Date.
In 1593, Munenobu died of illness in Kyōto at the age of twenty-two. The Endō clan was inherited by his younger brother, Endō Tsunenobu.